Author Contributions: Dr Baxter had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Baxter, Virnig, Tepper.
Acquisition of data: Baxter, Durham, Virnig.
Analysis and interpretation of data: Baxter, Habermann, Tepper, Durham, Virnig.
Drafting of the manuscript: Baxter, Habermann.
Critical revision of the manuscript for important intellectual content: Tepper, Virnig.
Statistical analysis: Baxter, Habermann, Durham, Virnig.
Obtained funding: Baxter.
Administrative, technical, or material support: Habermann, Durham.
Study supervision: Baxter, Tepper, Virnig.
Financial Disclosures: None reported.
Funding/Support: This research was supported by a Veterans of Foreign Wars Surgical Oncology research grant and by the University of Minnesota Comprehensive Cancer Center. Dr Baxter is supported by a University of Minnesota Cancer Center Clinical Scholars Award and by an American Society of Clinical Oncology Career Development Award.
Role of Sponsor: The funding organizations played no role in the design or conduct of the study, in the collection, management, analysis, or interpretation of the data, and did not participate in preparation, review, or approval of the manuscript.
Acknowledgment: We would like to thank Mary Knatterud, PhD, Department of Surgery, University of Minnesota, for her helpful editorial suggestions. Dr Knatterud received no compensation for her contribution to this manuscript.